Unica (river)

The Unica is a river in Slovenia. It starts as the underground confluence[2] of the Pivka and the Rak in the Planina Cave. This is the largest confluence of underground rivers in Europe. 300 meters (980 ft) further, the Unica emerges near Planina. It then is about 10 kilometers (6.2 mi). It flows north through the Planina Karst Field (Planinsko Polje) through the municipalities of Postojna, Cerknica, and Logatec, where it returns underground.[3] It then flows for about another 10 kilometers (6.2 mi) underground, emerging 142 meters (466 ft) lower[1] at multiple springs near Vrhnika to form the Ljubljanica River.

The confluence in Planina Cave
Physical characteristics
  locationUnderground confluence of the Pivka and the Rak in Planina Cave
  coordinates45°49′11.17″N 14°14′46.51″E
  elevation500 m (1,600 ft)
Ljubljanica near Vrhnika
308 m (1,010 ft) (underground)[1]
Length20 km (12 mi)
  average13 m3/s (460 cu ft/s) (at the source in Planina Cave), 24 m3/s (850 cu ft/s) (at the outflow in Vrhnika)
Basin features
ProgressionLjubljanicaSavaDanubeBlack Sea


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